Centrifugal pump.



H. A. PRINDLE.

GBNTR'IFUGAL PUMP. APPLICATION FILED JULY 3. 1906. 928,327'I Patented July 20, 1909.

2 SHEETS-SHEET l,

H. A. PRINDLE.

CENTRIFUGAL PUMP.

APPLICATION Hum JULY a, 190e.

PatentedvJuly 20, 1909.

PATENT OFFICE.

AHARRY A. PRINDLE, OF PHILADELPHIA, PENNSYLVANIA.

CENTRIFUGAL PUMP.

Specification of Letters Patent.

Patented July 2o, 1909.

Application tiled July 3,` 1906. Serial N o. 324,595..

To all whom it concern:

Be it known that I, HARRY A. PiiiNnLn, :i citizen of the United States, residing in Philadelphia, Pennsylvania, `have invented certain Improvements in Centrifugal Pumps, of which the following is a specification.

One object of my invention is to provide a pump of the turbine type primarily constructed so that its efficiency shall be relatively high and which at the same time shall be .relatively inexpensive to inanufiicture, as well have its parts so arranged that its interior is readily accessible.

I further desire to so arrange the various parts of the pump that under operatingv conditions the pressure of fluid exerted upon its movable elements shall be balanced ;l that is, so distributed that there shall be practif cally no end thrust in either direction upon' the driving shaft.

A further object of the invention is to provide certain improvements in the detail construction of a pump having the above characteristics by which I am enabled to secure a higher efficiency of operation than would otherwise. be the case.

These objects I attain as hereinafter set forth, reference being had to the accoinljianyingl drawings, in which Figure l, is a vertical section of the preferred form of .-ny improved pump; Fig. 2, is a vertical section taken on the line Q-JZ, Fig. l, further illnstratii'ig its construction;

Figs 25, 4 and 5, are respectively a vertical section and fragmentary elevations of the two faces of the part l shall hereafter refer to as the lvane plate and Figs. G, 7 and 8 are respectively a vertical section and eleva tions of the t-wo faces of the part I shall designate as the preventer plate.

In the `above drawings, A` represents the p'mp casing which consists of two castings A' and A? i'es1 e.ctively l'novided with supporting feet. 1 1, and n. The first of these `castings-has at its center an inlet or opening cf'through which extends the driving shaft l5 which is partially supported by a bearing formed in the casting A2, as shown in Fig. 1 ;the other end of said shaft being` supportf ed in any desired. way, either by a separate structure oi' by a suitable bearinrr formed in the conduit boltedto the face o the casting A" and forming a continuation of the inlet c2. The two castings A and A2 together forni the pump chamber proper, outside of which they unite to form an annular conduit. c4, preferably of a uniform cross .sectionalarea, for the reception` of liquid delivered from the chamber. communicates with the outlet' o1' discharge opening fr, which it will be understood may be placed at any desired point on the pump casing.` t

Keyed to the shaft B within the chamber formed by thetwo castings A and A2 are a pair of runners or movable elements C and C', which may be described as consisting of vltwo substantially parallel plates or disks between which extend the spirally `formed vanes c and c.` The siace r spaces between the disks of the rui ner C open. on that side of the runner adjacent to and in coniiiinnication with the inlet opening a2, While tl e ruimer C, though of substantially the same construction, has its central opening on its face most distant from the runner C.

It will be understoodv that the two castings A and A2 are bolted or clamped t0- gether in such a manner as to clamp within them two plates l) and E, the first of which extends betwen the runners C and C', there being portions c2 on both of these extending toward each other and carrying a sleeve fitted into a suitable opening in the plate D. Said plate, shown in Figs. 3, 4t and 5, is

for conducting the liquid discharged by the runner C to suitable openings e in the periphery of the preveiiter plate E, -,from whence said liquid is conducted inwardly toward the shaft., though the space between the preventer plate E and the shell ofthe casting A2 and to the ii'ilet\of the runner C..

It is to be noted that the\chaiinels d are the present instance, are cast i itegral with the vane or diversion plate I), but may, as described and claimedin iny appliiation for ll S. latent, No. 324,594, filedJul 3, 1906, be removed therefrom andadjustalhc. It is further to be noted that the channels el do not extend througlifthcse guide varies d in linesvparallel to the' shaft B, but extend in the direction of helical lines formed'on fluid gradually and oppose its flow as little as possible. The openings or\channels e in the periphery of the preventer plate E are preferably elongated so asto freely receve the Huid delivered4 through the cham.

Said conduit widened or thickened at its periphery d, p. and through this part extend channels al y formed through guide vanes d2 which, in

the surface of a cylinder having said shaft` ,y as its axis, so as to change the direction of` u 5 l nels al and conduct it toward the inlet of the runner C. l

Under operating conditions fluid enters or is driven into the easing A through the inlet a2, from whence after passinor into the interiorof the runner C 1t isdischarged from the'periphery of said runner into the channels al". It willbe seen that such fluid has a rotary motion and inasmuch as said channels` are' particularly -designed to receive said liquid and gradually change'its direction of fiow from a -rotary direction toa direction parallel to the shaft B, there is but little loss of energy due to eddies or friction with the parts of the pum I Passing from the channels el into and through the channels e, said fluid flows between the preventer plate E and the shell of the casting A2, toward the shaft B and thence to the intake of the runner C. From the periphery of this runnerthe fluid is rdischarged between the guide .vanes d2 of the plate D and thence through the annular spaces between the two castings A and A into 'the discharge chamber a* and to the outlet a5.

If desired, I may provide guide vanes d* Voil either one or both faces of the plate D, as

shown in Figs. 3, V4c and 5, and similarly may provide vanes e3 on either or both sides of the plate E. In the event of placing them on the plate D and on the face of the plate E- adjacent to the runner G, they would serve the purpose of directing outwardly 1. The combination of a pump'A casing having' a discharge chamber, a vane plate therein, a shaft extending through the casing, runners fixed to said shaft on oppositel runner to the discharge chamber, with a i second plate between the second runner and the wall of the pump casing, there being a A channel or channels between said plate and said casing connecting the channels of the vane plate with the intake of the second runner, substantially as described. A

2. lThe combinatlon of a pump casing having a pump chamber and a discharge chamber, 'a shaft extending through the casing, two runners fixed to the shaft haying their intake openings on their outer faces, a fixed plateextending between the runners, and having passages in its periphery placedl to transfer liquid from one runner across the plane of the other, a second `plateindependent of the casing structure extending between the second runner and the wall of the pump casing, there being passages accessible by the removal of the second plate for conducting fluid from the l periphery of the first -runner to the intake of the second runner, and other passages-'for conducting fluid from the second runner to the discharge chamber, each of said run ners consisting of two substantially parallel disks provided With-helically.disposed guide vanes between theml substantially (as described.

In testimony whereof, l-have signe y myv name to' this specification, in the presen of two subscribing witnesses.

HARRY A. PRINDLE.'

Witnesses C. W. FowLnR, PAUL A. BLAIR. 

